Retailers (NYSE: WMT) and Costco Wholesale (NASDAQ: COST) are two of the world's largest companies. They've also been remarkably successful investments. Over their lifetimes, they've each turned a $10,000 investment into millions of dollars.

However, that doesn't mean investors should necessarily run out and buy shares. Instead, take a step back and look at the big picture. Worth hundreds of billions of dollars today, these behemoths require a good entry price to pay off for your portfolio.

Do they warrant your hard-earned cash today?

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Source Fool.com